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STLSubmission 2005-04-0633 <br /> Fuel Oxygenates by 8260B . <br /> Treadwell & Rollo-San Francisco ' <br /> Attn David Dixon <br /> 555 Montgomery Street Suite 1300 , <br /> San Francisco, CA 94111-2554 <br /> Phone (415)955-9040 Fax (415) 955-9041 <br /> Project 2597 10 Received 04/20/2005 14 00 <br /> Carando <br /> Batch QC Report <br /> Prep(s) 50308 Test(s) 82608 ' <br /> Matrix Spike ( MS/MSD ) Soil QC Batch#2005104124-01 62 <br /> MS/MSD Lab ID 2005-04-0634-003 <br /> MS 2005104124-01 62-011 Extracted 04/24/2005 Analyzed 04/241200511 11 <br /> Dilution 100 <br /> MSD 2005104124-01 62-037 Extracted 04/24/2005 Analyzed 04/241200511 37 <br /> Dilution 1 00 <br /> Compound Conc ucilKci S k Level. Recovery% Limits% Fla s <br /> MS MSD Sample ug/Kg MS MSD RPD Rec RPD MS MSD <br /> Methyl tert-butyl ether 516 520 ND 453 1139 1095 39 65-165 20 <br /> Benzene 48 8 51 7 ND 453 1077 1088 1 0 69-129 20 <br /> Toluene 510 537 ND 453 1126 1131 0 4 70-130 20 <br /> Surrogate(s) <br /> 1 2-Dichloroethane-d4 503 488 500 1006 97 6 72-124 <br /> Toluene-d8 542 542 1 1 500 1084 1084 75-116 <br /> Severn Trent Laboratories, Inc 05/04/2005 1306 <br /> STL San Francisco'1220 Quarry Lane Pleasanton CA 94566 <br /> A Pan Of Seq Trent Pk Tel 925 484 1919 Fax 925 484 1096"www stl-inc com'CA DHS ELAP#2496 Page 13 of 15 ' <br />